Probably because old calendars (such as the Persian Calendar) used 360 days for a year-when they watched the stars they saw them revolve around the North Star one degree per day.
September 27, 2015 will bring a supermoon lunar eclipse at nightfall. The last lunar eclipse of this magnitude occurred in 1982, and the next one of a similar magnitude will be in 2033. A lesser lunar eclipse will come in 2018. The lunar eclipse part of this phenomenon, according CTV, is caused by the Earth inserting itself between the sun and the moon. As this happens, the Earth casts its shadow on the face of the moon.
In the event that weather doesnât cooperate tonight, weâll have three additional chances over the next year and a half. The next one, on October 8th of this year, will be fleeting as the eclipse coincides with the moonâs setting at sunrise. Next year, the orbits align similarly with lunar eclipses on April 4th, 2015 (also in progress at moonset) and September 28th, that one visible in its entirety.